I am currently working in a project of making a fuel efficient car for Shell eco marathon, i will use a Michellen tyre with dimension of 45/75 R 16. I need to know what is the rim size i should look for and where to find it on the web?

Looking at the spec sheet, the important dimension to note is "D", the Bead Seat Diameter - at 405.6mm, this rates it very closely to the standard "20-inch" BMX rim BSD of 406mm. However the required rim section is some 30-34mm between the beads, and very few bike rims are going to be that wide, although there should be something around. The big problem I can see is finding something with a "hookless" bead profile - the vast majority of bike rims (excluding tubulars of course) are the hooked variety.

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